Pinking attachment



Feb. 16, 1937. E. F. HORN 2,071,230

PINKING ATTACHMENT Filed Aug. 6, 1955 2 Sheets-Sheet 1 Em z'Z Horn INVENTOR ATTORNEYS Feb. 16, 1937. E. F. HORN 2,071,230

PINKING ATTACHMENT Filed Aug. 6, 1935 2 Sheets-Sheet 2 Emil F170? INVENTOR ATTORNEYs Patented Feb. 16,1937

, UNlTED rmimzc ATTACHlt1ENT Emil r. Horn, Long mine City, N. Y.

Application August a, 1935, Serial No. 34,953

2 Claims.

This invention relates to sewing machine pinking or cutting attachments and has for its general object the provision of a device of this character by which to more suitably accomplish the pinking or cutting of materials simultaneously with the sewing thereof.

The use of pinking attachments in combination with a sewing machine in the past has evidenced certain difilculties in operation resulting in faulty workmanship to some extent due to the inadequacy of the arrangement to accommodate I materials of various characteristics. In view of the above, it is a further object of my invention to provide a pinking attachment 1,; and associated drive mechanism of a novel arrangement whereby to facilitate the regulation of the pinking wheel movement in accurate co-- ordination with the sewing feeder mechanism so that the combined mechanism may efiiciently m accommodate materials of "various thickness and other characteristics so as to produce work of an,

a) The invention will be fully. and comprehensively understood from a consideration of the followin detailed description when read in connection with the accompanying drawings which form part of the application, with the understanding, however,

35 that the'improvement is capable of extended application and is not confined to the exact showing of tha'drawings nor to the precise-construction described and, therefore, such changes and modifications may be made therein as do not afiect the m spirit of the invention nor exceed the scope thereof as expressed in the appended claims.

' In the'drawings: V i

Fig. 1 is a rear side elevational view of a typical I sewing machine incorporating my pinking at- 5 tachment and the associated drive.

2 is an elevational view of the head-end of asewing machine as shown in Fig. l.

Fig. 3 is a side elevation of my pinking attach- I ment in operating position apart from the sewing Pig. 4 is a front elevation of the device as shown in Pig. 3.

5 is a top elevational view with parts in;

section taken on line 55 of Fig. 3; and 5s Fig. 6 is a detail sectional view of the pinking pins 25.

- lever" 2 I.

wheeldriving clutch taken on line 66 of Fig. 4.

Referring now to the drawings for a more detailed description thereof, the numeral 8 indicates a typical sewing machine arm frame overhung to support the sewing-head 9. The armirame 8 in integral with the bed III which forms the baseof the sewingmachine. At a suitable portion of the head 9 is attached the bracket ll of my pinking attachment such as by the lifter lever screw l2. In order that the position of the 10 bracket ll be accurately fixed the latter is provided with an angle plate 13 in which adjustment screws M are threadedly engaged so as to bear against a vertical surface of the head 9.

The bracket II is suitably formed preferably 15 ofiset as shown in Fig. 3 so as to hold the pinking cutter wheel I5 with its axis on a longitudinal line with the sewing needle of the machine. The

bracket l I comprises an ofi'set arm l6 from whichdepends the plate [1, the latter being slotted to 2 receive the tongue 18 of a slide block l9. Suitable means such as the cap screws 20 are installed in the slide block I9 to hold same slidably in the slot of the plate ll. O

The movement of the pinking wheel IE to .ineifective position or'into operative position is accomplished by moving a lever handle 2| which is fulcrumed on'the bracket H by the stud shaft. 22, being journalled in the latter and aifixed to the'lever handle 2|. The stud shaft 22 is 3 integral with the hub of a resilient arm 23 which at its free end 24 is forked and fitted with opposed The functionof the resilient arm 23 is to hold the pinking wheel under pressure against the work and is-flexibly connectedto the slide block I9 supporting the pinking wheel It by having'its pins 25 engage in aegroove in an adjusting screw 26. The purpose of the screw 26 is to facilitate the adjustment of the pressure p imparted to the pinking wheel s by the resilient 6 arm 23, the screw 26 being equipped with a lock nut 21 to fix the adjustment. The arm 23 has its intermediate portion formed as a leaf spring to provide the required resilience for imparting pressure to thepinking wheel IS. The lever 5 handle 2| is to be locked ineither position as required, for which purpose a pin 28 slides in an aperture in the lever 2| to be urged intoa recess '29 cut in the arm l6 of the bracket H into which the pin 28 is urged by the leaf spring 30 to which -5 it is attached,'in the lowermost position of. the.

In the upper position of the latter, shown in dot and dash, the pin 28 engages the upper surface of the arm. Hi to lock this position.

The pinking cutter wheel [5 has its periphery formed to a zig-zag cutting edge which in cutting bears against a roller 3|, the trunnions of which are journalled in the bed IILof the machine or may preferably be supported in the needle plate thereof. The wheel I5 is mounted for rotation on the slide block I 9 by the shoulder screw 32.

The pinking wheel I5 during its cutting operation is rotated intermittently and receives its drive from an oscillating lever hereinafter described. To permit the drive to complete its return'stroke after the forward stroke has been made. the pinking wheel I 5 is equipped with a slip clutch which accomplishes this function, see Fig. 6. From the body of the pinking wheel I5 extends axially a cylindrical drum 33. Within the drum 33 is arranged a pair of semi-circular clutch shoes 34, which at the point 35 are engaged with each other, their ends 36 diametrically opposite the point 35 being spaced from each other. The drive for the pinking wheel is transmitted to the arm 31 which carries a circular plate 38 at one end abutting the drum 33, in the center of which an aperture'39 is cut of sufficient size to permit the plate to swing a. limited distance transversely of the hub of the pinking wheel I5. An expansion dog 40 is aflixed radially on the plate 33 to take its place in the slot formed by the ends 36 of the shoes 34. Diametrically opposite the dog 40 a lug 4| is aflixed to the plate 38, which lug rides in an opening 42 cut adjacent the point 35 in the shoes 34. A helical spring 43 presses between the lug 4| and the lower shoe 34. The ends 36 are so formed that with the arm 31 in the upper position, shown in full, the shoes 34 are expanded into gripping contact with the drum 33 by the leverage of the dog being swung between the ends 36. With the arm 31 in its lower position shown in dot and dash, the dog 4|] v releases the shoes 34. in that the ends 36 are cut away to provide ample clearance for the dog 40 in the latter position. It will be observed that the arrangement of the dog 40 and the lug 4| on the plate 38 causes the arm.3| to oscillate from a point on the dog 40, during which the lug 4|" compresses the spring 43 to assist theshoes 34 in their clutching function.

The drive for the pinking wheel I5 in coordination with the sewing feeder mechanism will now be described, reference being had to Figs. 1 and 2. The usual sewing machine is provided with a feed rocker shaft 44, the function of which is to drive the feeder dog of the sewing mechanism. Onto the shaft 44 is affixed an arm 45 which is flexibly connected at its free end to a connecting rod 46, the upper end of the rod 46 being flexibly connected to one end of a rocker lever 41. The lever 41 is fulcrumed on a screw 46 secured to the arm 8 of the machine, the opposite end of the lever being flexibly joined to a second connecting rod 49, which rod is pivotally connected to a lever 50, see Fig. 3, so that a rocking motion of the arm 45 transmits an oscillatory motion to the lever 50.

It is to be noted here that in accordance with my invention the degree of rotation of the pinking wheel I5 may be varied at the will of the operator so as to accommodate same to various materials. To accomplish this purpose, the fulcrum 5| of the lever 50 is adjustable to and from the center of the wheel 'I5 by having its clamping screw 52 slidably carried in a slot 53 cut in an arm 54, which arm is integral with the bracket II. The opposite end of lever 50 is pivotally connected to the arm 31 by the shoulder screw 55 which moves in the slot 56 cut in the arm 31.

It will be observed that adjustment of the fulcrum 5| to, a position toward the wheel I5 will correspondingly decrease the eifective length of the arm 31 so 'as to increase the angular movement of the wheel I5, thus to accommodate the degree of rotation of pinking wheel I5 to suit the particular material to be cut.

What is claimed as new is:

1. The combination with a sewing machine having a feed rock shaft adapted for actuation of a sewing feeder mechanism, of a pinking wheel operated from said shaft in synchronism with said sewing feeder mechanism and means for raising and lowering said'pinln'ng wheel respectively from and to effective position and-comprising a swingable resilient arm including an operating lever associated therewith and latch means on said lever adapted to hold said pinking wheel in either position.

2. A pinking attachment adapted for operation coactively with a sewing machine comprising a bracket adapted to be affixed to a sewing machine head and including a vertical guideway, a slide block disposed for vertical movement in said guideway, a pinking wheelrotatably carried on said slide block, an adjustable screw including a groove at its free end extending from said slide block, a resilient arm pivotally carried on said bracket and having its free end engaging in said adjustable screw, a lever associated with said resilient arm and forming meansafor raising and lowering said pinking wheel, and actuating mechanism adapted for rotation of said pinking wheel.

EMIL F. HORN. 

